Mr Pankhurst faces a third charge of possessing a computer used for "propagating" the group's ideology.

Mr Khan said he was expecting a computer containing e-versions of the books, also easily available, to be produced as evidence.

"Mr Reza Pankhurst had upon his arrest his business office ransacked and kept as evidence by state security," he said.

"Yet none of the eight computers seized have been presented as evidence."

Mr Khan is also awaiting further medical evidence on a third Egyptian national who was allegedly tortured so badly that he was left on crutches.

Charges against this man were later dropped.

Torture claims

The lawyer said the trial was becoming "increasingly sinister" and complained that the Egyptian court was not yet providing a proper translation service from Egyptian Arabic to English for his clients.

He said the families of the defendants were suffering particularly over Christmas.

The lawyer said: "Christmas is a family time for Muslims as well and it is difficult for the whole family, especially the children."

Mr Khan expects the trial to resume on Sunday with live evidence from state security guards the British men accuse of torturing them while in
confinement.

The three men have claimed they were tortured and forced to sign confessions while in custody.

Mr Khan said: "This will give us an opportunity to question those men responsible for the treatment of the boys.

"Unfortunately, as all the boys were blindfolded when they were being mistreated and tortured they are unable to identify who did what."

Egyptian authorities blame Hizb ut-Tahrir for an attempted coup in 1974 and involvement in terrorist operations.